Responses of the East Asian Summer Monsoon in the Low‐Latitude South China Sea to High‐Latitude Millennial‐Scale Climatic Changes During the Last Glaciation: Evidence From a High‐Resolution Clay Mineralogical Record

Zhao, Shaohua; Liu, Zhifei; Colin, Christophe; Zhao, Yulong; Wang, Xingxing; Jian, Zhimin

doi:10.1029/2017pa003235

Cited by 40 publications

(38 citation statements)

References 87 publications

(292 reference statements)

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“…5e ). The illite content of Yellow River sediments was <60% and smectite content was ~15–20%, the illite/smectite ratio was <6 31 – 33 . About 40% of the shallow sediments on the southern Yangtze Shoal are located in the source region of the Yellow River, while the other 60% are in the Yangtze River source region.…”

Section: Resultsmentioning

confidence: 95%

“…The age at the base of the core is 10806 yr B.P., indicating Holocene strata. Two cores revealed horizontal bedding and sand-mud interbed of structural characteristic 33 . Combined with age data and others research 34 – 36 , stratum frame of cores was normal sequence.…”

Section: Resultsmentioning

confidence: 99%

“…Clay mineralogy was analysed by X-ray diffraction (XRD) using a PANalytical X’Pert PRO diffractometer at the State Key Laboratory of Marine Geology (Tongji University) on oriented mounts of carbonate-free clay-sized particles (<2 μm) 32 , 33 . All the samples were measured 3 times under air-dry conditions after ethylene glycol solvation for 24 h and heating at 490 °C for 2 h. Identification and interpretation of clay mineral species were made according to the (001) basal reflections on three XRD diagrams.…”

Section: Methodsmentioning

confidence: 99%

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Temporal and spatial characteristics of sediment sources on the southern Yangtze Shoal over the Holocene

Cao

Cai

Zheng

et al. 2018

Sci Rep

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The sediment sources of the Yangtze Shoal were traced by analysing surface and core sediment particle size, detrital and clay minerals, carbon and nitrogen isotopes, and radioisotope dating. In the estuary, the sediments are dominated by silty clay, high stable mineral, and extremely high illite/chlorite. Stable organic carbon isotopes (δ13C-TOC) indicated a marine-dominated mixture. On the shoal, the sediments are mainly composed of fine sand, high unstable mineral. The δ13C-TOC indicated predominantly marine sedimentation. The average TOC of core sediments was ~0.26%, and the average TN was ~0.05%. The TOC/TN was 5.4–7.8, the δ13C-TOC was −19.8 to −22.1‰, and the age of the sediments spanned the last ~10.8 ka (Holocene). The sediments and provenance of the Yangtze Shoal have been controlled by the East Asian monsoon, sea level change, riverine sediment flux and ocean circulation. The intervals 8.3–6.3 ka and 3.8–1.5 ka, are characterized by Yangtze River sources, whereas 6.3–3.8 ka and 1.5–0.8 ka, are characterized by a source mixture with Yellow River input. Tracing the multiple sources effectively confirms the hypothesis that the southern Yangtze Shoal was a delta formed by combined sedimentation from the Yangtze River and Yellow River during times of low sea level.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Temporal and spatial characteristics of sediment sources on the southern Yangtze Shoal over the Holocene

Cao

Cai

Zheng

et al. 2018

Sci Rep

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“…Greenland δ 18 O is commonly regarded as a proxy dataset for past temperature variability over Greenland, possibly representative for the North Atlantic or northern hemisphere temperature evolution 54 . However, it also represents the most commonly used palaeoclimate and chronological reference dataset for disentangling past climate variability during the last glacial cycle in the Northern Hemisphere 2,3,12,13,39,[116][117][118][119][120] . The Sofular cave δ 13 C dataset 1 represents a reliably and independently U/Th dated terrestrial cave record that would allow for direct comparison with (south-eastern) European loess deposits.…”

Section: Methods Filter Settingsmentioning

confidence: 99%

Smoothed millennial-scale palaeoclimatic reference data as unconventional comparison targets: Application to European loess records

Zeeden

Obreht

Vereș

et al. 2020

Sci Rep

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Millennial-scale palaeoclimate variability has been documented in various terrestrial and marine palaeoclimate proxy records throughout the northern Hemisphere for the last glacial cycle. its clear expression and rapid shifts between different states of climate (Greenland Interstadials and Stadials) represents a correlation tool beyond the resolution of e.g. luminescence dating, especially relevant for terrestrial deposits. Usually, comparison of terrestrial proxy datasets and the Greenland ice cores indicates a complex expression of millennial-scale climate variability as recorded in terrestrial geoarchives including loess. Loess is the most widespread terrestrial geoarchive of the Quaternary and especially widespread over Eurasia. However, loess often records a smoothed representation of millennial-scale variability without all fidelity when compared to the Greenland data, this being a relevant limiting feature in integrating loess with other palaeoclimate records. to better understand the loess proxy-response to millennial-scale climate variability, we simulate a proxy signal smoothing by natural processes through application of low-pass filters of δ 18 O data from Greenland, a highresolution palaeoclimate reference record, alongside speleothem isotope records from the Black Sea-Mediterranean region. We show that low-pass filters represent rather simple models for better constraining the expression of millennial-scale climate variability in low sedimentation environments, and in sediments where proxy-response signals are most likely affected by natural smoothing (by e.g. bioturbation). Interestingly, smoothed datasets from Greenland and the Black Sea-Mediterranean region are most similar in the last ~15 ka and between ~50-30 ka. Between ~30-15 ka, roughly corresponding to the Last Glacial Maximum and the deglaciation, the records show dissimilarities, challenging the construction of robust correlative timescales in this age range. from our analysis it becomes apparent that patterns of palaeoclimate signals in loess-palaeosol sequences often might be better explained by smoothed Greenland reference data than the original high-resolution Greenland dataset, or other reference data. This opens the possibility to better assess the temporal resolution and palaeoclimate potential of loess-palaeosol sequences in recording supra-regional climate patterns, as well as to securely integrate loess with other chronologically better-resolved palaeoclimate records.

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“…At the same time, coastal zones have the functions of tourism and leisure, disaster prevention and mitigation, and ecological maintenance [1,[11][12][13][14]. They are the core elements and important driving forces for the rapid development of the coastal tourism industry and play an indispensable role in the rapid development of coastal tourism and the construction of ecological civilization [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Underwater Topography, Geomorphology and Sediment Source in Qinzhou Bay

Cao¹,

Cai²,

Qi³

et al. 2020

Preprint

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Human activities for exploitation and utilization of coastal zones have transformed coastline morphology and severely changed regional flow fields, underwater topography, and sediment distribution in the sea. In this study, single-beam bathymetry coupled with sediment sampling and analysis was carried out to ascertain submarine topography, geomorphology and sediment distribution patterns and explore sediment provenance in Qinzhou Bay, China. The results show the following. 1) The underwater topography in Qinzhou Bay is complex and variable, with water depths in the range of 0–20 m. It can be divided into four underwater topographic zones: the central (outer Qinzhou Bay), eastern (Sanniang Bay), western (east of Fangcheng Port), and southern (outside of the bay) parts. 2) Based on geomorphological features, the study area comprises four major submarine geomorphological units (i.e., tide-dominated delta, tidal sand ridge group, tidal scour troughs, and underwater slope) and two intertidal geomorphological units (i.e., tidal flat and abrasion platforms). 3) Sandy sediments are widely present in Qinzhou Bay, accounting for 70% of the total sediments. From the mouth of the Maowei Sea to the offshore, the sediments gradually become coarser, shifting from sandy mud to muddy sand, and then to fine sand and medium–coarse sand. The detrital minerals contained in the sediments mainly consist of quartz, feldspar, debris, ilmenite, leucosphenite, and tourmaline, whereas the clay minerals are dominated by kaolinite, followed by illite and smectite. The sediment provenance is mainly terrigenous input from near-source rivers. With sea reclamation and dam construction, outer Qinzhou Bay has experienced enormous morphological variation of its coastline. Together with the channel effect where the velocity of ebb tide is greater than that of flood tide, the underwater topography is characterized by increased scale and height difference of troughs and ridges as well as enhanced offshore deposition.

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Responses of the East Asian Summer Monsoon in the Low‐Latitude South China Sea to High‐Latitude Millennial‐Scale Climatic Changes During the Last Glaciation: Evidence From a High‐Resolution Clay Mineralogical Record

Cited by 40 publications

References 87 publications

Temporal and spatial characteristics of sediment sources on the southern Yangtze Shoal over the Holocene

Temporal and spatial characteristics of sediment sources on the southern Yangtze Shoal over the Holocene

Smoothed millennial-scale palaeoclimatic reference data as unconventional comparison targets: Application to European loess records

Characteristics of Underwater Topography, Geomorphology and Sediment Source in Qinzhou Bay

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